CN115242267A - Power line communication PLC method and device - Google Patents
Power line communication PLC method and device Download PDFInfo
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- H04L47/2425—Traffic characterised by specific attributes, e.g. priority or QoS for supporting services specification, e.g. SLA
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Abstract
The application provides a Power Line Communication (PLC) method and a device, which can be applied to a first node in a PLC system comprising at least three nodes, wherein the at least three nodes are in a full-duplex working mode; and the first node determines whether to interrupt the sending of the second information according to the priority of the second node and/or the priority of the first information, wherein the second information is the information currently sent by the first node. According to the scheme, the information of different nodes can be prevented from conflicting, rapid communication among multiple nodes is achieved, and the communication efficiency of the PLC system is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a PLC (programmable logic controller) method and device for power line communication.
Background
A Power Line Communication (PLC) is a power communication system in which a power transmission line is used as a carrier signal transmission medium. In order to realize fast communication between multiple nodes, special time slots divided on a time axis can be generally adopted for transmitting low-delay data between the multiple nodes, but when the low-delay data of a certain node arrives at a time after the special time slots, the node can only wait until the next special time slot to send out the data, which can cause data delay, so that the speed of a PLC communication system is low. A backoff preemption mechanism of Carrier Sense Multiple Access (Carrier Sense Multiple Access) can also be generally adopted to realize fast communication between Multiple nodes, but there is a possibility that two nodes send data collision, which causes data transmission delay or failure, so that the rate of the PLC communication system is low.
Disclosure of Invention
The embodiment of the application provides a PLC method and a PLC device, which can be used for avoiding information of different nodes in a PLC system from conflicting, realizing rapid communication among multiple nodes and improving the communication efficiency of the PLC system.
In a first aspect, an embodiment of the present application provides a PLC method, which may be applied to a first node in a PLC system including at least three nodes, where the at least three nodes are in a full-duplex operating mode, and the method includes: the first node receives first information from a second node, wherein the second node is any one of the at least three nodes except the first node; and the first node determines whether to interrupt the transmission of the second information according to the priority of the second node and/or the priority of the first information, wherein the second information is the information currently transmitted by the first node.
In the scheme provided by the application, a plurality of nodes in the PLC system can be in a full-duplex working mode, namely, information can be transmitted and received simultaneously. On the basis, the first node can determine whether to interrupt the transmission of the current information according to the priority of the second node and/or the priority of the first information from the second node, the interruption of the transmission of the current information can actively avoid channel resources, the transmission of low-priority nodes or low-priority information is interrupted by high-priority nodes and/or high-priority information, the channel resources are occupied preferentially, information collision among multiple nodes in the PLC system can be solved, the transmission delay of high-priority information, such as control instructions, is reduced, the rapid communication among the multiple nodes is realized, and the communication efficiency of the PLC system is improved.
As a possible implementation, the determining, by the first node, whether to interrupt the sending of the second information according to the priority of the second node includes: the first node determines to interrupt the transmission of the second information in a case where the priority of the second node is greater than the priority of the first node.
In the scheme provided by the application, the first node can only consider the priority of the node, determine whether to interrupt the transmission of the current information according to the priority of the node, actively avoid channel resources when interrupting the transmission of the current information, and realize that the high-priority node preferentially occupies the channel resources, so that the rapid communication among multiple nodes can be realized, and the communication efficiency of the PLC system is improved.
As a possible implementation manner, the determining, by the first node, whether to interrupt the transmission of the second information according to the priority of the first information includes: the first node determines to interrupt transmission of the second information in a case where the priority of the first information is greater than the priority of the second information.
In the scheme provided by the application, the first node can determine whether to interrupt the transmission of the current information according to the priority of the information by only considering the priority of the received information and the priority of the current information transmitted by the first node, and the interruption of the transmission of the current information can actively avoid channel resources, so that the high-priority information can preferentially occupy the channel resources, thereby realizing the rapid communication among multiple nodes and improving the communication efficiency of a PLC system.
As a possible implementation, the determining, by the first node, whether to interrupt the transmission of the second information according to the priority of the second node and the priority of the first information includes: under the condition that the priority of the second node is greater than that of the first node and the priority of the first information is greater than that of the second information, the first node determines to interrupt the sending of the second information; or the first node determines to interrupt the sending of the second information under the condition that the priority of the second node is equal to the priority of the first node and the priority of the first information is greater than the priority of the second information; or the first node determines to interrupt the transmission of the second information under the condition that the priority of the second node is greater than the priority of the first node and the priority of the first information is equal to the priority of the second information.
In the scheme provided by the application, the first node can simultaneously consider the node priority and the information priority, determine whether to interrupt the transmission of the current information according to the node priority and the information priority, actively avoid channel resources when the transmission of the current information is interrupted, and realize that the high-priority node and the high-priority information preferentially occupy the channel resources, so that the rapid communication among multiple nodes can be realized, and the communication efficiency of the PLC system is improved.
As a possible implementation, the determining, by the first node, whether to interrupt the transmission of the second information according to the priority of the second node and the priority of the first information includes: and under the conditions that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the first type information, the first node determines to interrupt the transmission of the second information.
In the scheme provided by the application, the first node can consider the node priority and the information priority at the same time and also can consider the information type, whether the transmission of the current information is interrupted is determined according to the node priority, the information priority and the information type, the interruption of the transmission of the current information can actively avoid channel resources, and the high-priority node and the high-priority information can occupy the channel resources preferentially, so that the rapid communication among multiple nodes can be realized, and the communication efficiency of a PLC system is improved.
As a possible implementation, the determining, by the first node, whether to interrupt the transmission of the second information according to the priority of the second node and the priority of the first information includes: and under the conditions that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the second type information, the first node determines not to interrupt the transmission of the second information.
In the scheme provided by the application, the first node can consider the node priority and the information priority at the same time, and also can consider the information type, determine whether to interrupt the transmission of the current information according to the node priority, the information priority and the information type, interrupt the transmission of the current information to actively avoid channel resources, and realize that the high-priority node and the high-priority information preferentially occupy the channel resources, so that the rapid communication among multiple nodes can be realized, and the communication efficiency of the PLC system is improved.
As a possible implementation, the method further comprises: and after the preset time, the first node recovers the sending of the second information.
As a possible implementation, the method further comprises: the first node determines a priority of the second node according to any one of a Media Access Control (MAC) address, an Internet Protocol (IP) address, and a network identifier of the second node.
In a second aspect, an embodiment of the present application provides a PLC apparatus, which may be a first node in a PLC system including at least three nodes, and may also be an apparatus (e.g., a chip, or a system of chips, or a circuit) in the first node, where the at least three nodes are in a full-duplex operating mode. The communication device has the functionality to implement the actions in the method instance of the first aspect described above. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
As a possible implementation, the apparatus includes:
a transceiver unit, configured to receive first information from a second node, where the second node is any one of at least three nodes except the first node;
and the processing unit is used for determining whether to interrupt the transmission of the second information according to the priority of the second node and/or the priority of the first information, wherein the second information is the information currently transmitted by the first node.
As a possible implementation, the processing unit is specifically configured to: and determining to interrupt the transmission of the second information in the case that the priority of the second node is greater than the priority of the first node.
As a possible implementation, the processing unit is specifically configured to: in the case where the priority of the first information is greater than the priority of the second information, it is determined to interrupt the transmission of the second information.
As a possible implementation, the processing unit is specifically configured to:
under the condition that the priority of the second node is greater than that of the first node and the priority of the first information is greater than that of the second information, the sending of the second information is determined to be interrupted; or
Determining to interrupt the transmission of the second information under the condition that the priority of the second node is equal to the priority of the first node and the priority of the first information is greater than the priority of the second information; or alternatively
And determining to interrupt the transmission of the second information in the case that the priority of the second node is greater than the priority of the first node and the priority of the first information is equal to the priority of the second information.
As a possible implementation, the processing unit is specifically configured to: and under the conditions that the priority of the second node is smaller than that of the first node, the priority of the first information is greater than that of the second information, and the first information is the first type information, the second information is determined to be interrupted from being sent.
As a possible implementation, the processing unit is specifically configured to: and under the conditions that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the second type information, determining not to interrupt the transmission of the second information.
As a possible implementation, the processing unit is further configured to: and resuming the transmission of the second information after a preset time.
As a possible implementation, the processing unit is further configured to: and determining the priority of the second node according to any one of the MAC address, the IP address and the network identification of the second node.
In a third aspect, an embodiment of the present application provides a PLC apparatus, which may be a first node in a PLC system including at least three nodes, and may also be an apparatus (e.g., a chip, or a system of chips, or a circuit) in the first node, where the at least three nodes are in a full-duplex operating mode. The apparatus comprises a processor coupled with a memory for storing a program or instructions which, when executed by the processor, cause the apparatus to perform the method as provided by the first aspect or any of the embodiments of the first aspect.
In a fourth aspect, an embodiment of the present application provides a PLC system including the apparatus provided in the second aspect or the third aspect.
In a fifth aspect, the present application provides a computer-readable storage medium, in which a computer program or computer instructions are stored, and when the computer program or the computer instructions are executed, the method provided by the first aspect or any implementation manner of the first aspect is implemented.
In a sixth aspect, the present application provides a computer program product, which is characterized in that the computer program product includes computer program code, and when the computer program code is executed, the method as provided in the first aspect or any implementation manner of the first aspect is implemented.
Drawings
FIG. 1 is a schematic diagram of a time slot division;
FIG. 2 is a diagram illustrating a system architecture according to an embodiment of the present application;
fig. 3 is a schematic diagram of a full duplex based PLC communication node;
fig. 4 is a flowchart of a PLC method according to an embodiment of the present disclosure;
FIGS. 5-10 are schematic diagrams of a scenario of implementation of a method provided by an embodiment of the present application;
fig. 11 is a schematic structural diagram of a PLC apparatus according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a PLC apparatus according to an embodiment of the present application.
Detailed Description
The embodiment of the invention provides a PLC method and a PLC device, which can be used for avoiding information of different nodes in a PLC system from conflicting, realizing rapid communication among multiple nodes and improving the communication efficiency of the PLC system. The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In order to facilitate understanding of the embodiments of the present application, the technical problems to be solved by the present application are further analyzed and presented.
Full duplex communication is a duplex technology widely used for wired and wireless communication. In a wireless communication system, full Duplex communication may be achieved through Time Division Duplex (TDD), frequency Division Duplex (FDD), and In-Band Full-Duplex (IBFD). In TDD, two communication parties can use different time slots to distinguish uplink and downlink to realize full duplex communication, and at this time, the two communication parties use the same frequency, that is, one party can only be in a transmitting or receiving state at a certain time, so that the transmission or reception of a communication node is discontinuous and must be performed alternately. FDD uses different frequencies to distinguish between uplink and downlink, and both communication parties can simultaneously transmit and receive, but the frequencies used in the transmitting and receiving directions are different. In-Band Full-Duplex (IBFD) communication is that two communication parties transmit and receive signals at the same time and using the same frequency, and on one hand, IBFD can improve the utilization efficiency of the frequency spectrum, and on the other hand, can solve the problem of discontinuous transmission and reception of TDD communication.
The power line carrier communication is a power communication system using a power transmission line as a carrier signal transmission medium. Because the power transmission line becomes a necessary infrastructure for power transmission and utilization in the modern society, the carrier communication based on the existing power transmission line does not need to additionally increase the communication wiring cost, and meanwhile, the power transmission line has multiple advantages of wide coverage, economy, reliability and the like. However, the power transmission line is not favorable for the propagation of all communication carrier signals, and it is generally considered that the higher the carrier signal frequency is, the greater the propagation loss increase of the signals after passing through the line, so common power line carrier communication uses a lower communication frequency band, for example, the communication frequency band below 500kHz is used by the G3-PLC alliance standard, the communication frequency band below 12MHz is used by the IEEE1901.1 international standard, and the like. The limited available spectrum may result in a reduction in communication rates, e.g., the G3-PLC standard only supports low rates of less than 100 kbps. The low communication rate is disadvantageous for some applications requiring low-delay fast control, and most of the current PLC communication systems adopt a time division multiplexing power line (TDD) mechanism, which makes the low-delay objective difficult to achieve.
In order to solve the problem of low PLC communication rate, full-duplex PLC communication which can receive and transmit simultaneously can be realized based on the method of using analog domain echo cancellation and digital domain self-interference signal elimination. And meanwhile, the throughput rate of the full-duplex PLC system can be improved by receiving and transmitting. However, after the throughput rate of the system is increased, the problem of realizing rapid control among multiple nodes is still not solved.
At present, the technical solution of PLC communication for implementing fast control between multiple nodes is exemplified by the following two, wherein,
the first scheme comprises the following steps: a fixed TDD time slot is used.
Several types of time slots are defined in the P1901.1 protocol, as shown in fig. 1, each beacon period includes a beacon time slot, a TDD time slot, and a Carrier Sense Multiple Access (CSMA) time slot, and a specific TDD time slot in each beacon period can be used for transmitting low-latency data or control commands, that is, on a time axis, for each node, a series of dedicated TDD time slots are divided, and are dedicated to the node for transmitting the low-latency data or control commands. For example, when a node needs to send a control command, it needs to wait until a special TDD timeslot allocated to the node can send the control command.
The first scheme has the following defects: although the first scheme divides a special TDD slot on a time axis for transmitting a fast control command or low-latency data, 1) the system needs to reserve the special TDD slot for a control command that may be transmitted, when the control command arrives at a time after the TDD slot, the communication node can only wait until the next TDD slot to send the control command, which causes a delay of the control command, and the delay value depends on the length of the beacon period, and the delay value is larger when the length of the beacon period is larger. 2) When no control command is sent, the pre-reserved TDD time slot is wasted, so that the PLC communication system with limited bandwidth resources is lower in speed.
Scheme two is as follows: different backoff delay values are used to ensure that the high priority nodes preempt the channel in advance.
In the scheme, the control instruction does not need to be sent in a special TDD time slot, but the control instruction and other service data frames need to preempt a used channel according to a CSMA mechanism, that is, a certain node needs to monitor the channel before sending the control instruction, and a mechanism of preempting the channel after backoff random time is adopted to send the control instruction when the channel is idle. For the node sending the control instruction, a smaller back-off time value can be selected, so that the channel can be preferentially used.
The second scheme has the following defects: although the second scheme improves some of the disadvantages of the first scheme, for example, the second scheme no longer needs to waste TDD timeslots, so as to achieve improvement of bandwidth utilization, however, the second technical scheme adopts a preemptive manner, that is, which node preempts the channel first, other nodes have to wait for the channel to be idle. There may be disadvantages: 1) When data is being sent on a channel, a control command with high priority needs to wait for the channel to be idle before the channel can be preempted with high priority, which may cause control delay. 2) The back-off preemption mechanism of CSMA has the condition that two nodes send data collision. When data and control commands collide on a channel, control command transmission failure is caused, control delay is caused, and control failure may be caused in severe cases. In addition, the collision probability increases as the number of nodes participating in communication in the network increases, which may cause uncertainty in the transmission delay of the control command.
Therefore, the technical problems to be solved by the present application may include the following:
in the PLC communication system of the multiple nodes, based on the full duplex communication basis, each node can normally receive data of other nodes while sending the data, and by utilizing the characteristics, the multiple nodes are controlled and interrupted by priority, so that the nodes with high priority and low-delay data thereof can preferentially occupy channels, information conflicts of different nodes are avoided, rapid communication among the multiple nodes is realized, and the communication efficiency of the PLC system is improved.
Based on the above, the present application provides a PLC method and apparatus. Referring to fig. 2, fig. 2 is a schematic diagram of a system architecture according to an embodiment of the present disclosure. As shown in fig. 2, the system architecture 200 may include at least three nodes (e.g., node 1 through node N shown in the figure) that communicate with each other using the same channel.
Each of the at least three nodes may be in full duplex mode (e.g., FDD mode or IBFD mode, i.e., each node may enable simultaneous reception and transmission of data). Referring to fig. 3, fig. 3 is a schematic diagram of a full-duplex PLC-based communication node. As shown in fig. 3, the full-duplex PLC-based communication node may include PLC signal coupling, impedance matching, a primary transceiver isolation module, a secondary cancellation module, a tertiary baseband cancellation module, and the like. The primary transceiving isolation module may be implemented by a transformer or other similar circuit, and when the impedance of the impedance matching terminal is equivalent to the impedance of the PLC signal coupling terminal, isolation of a self-interference signal may be formed between Tx and Rx. After primary isolation, residual self-interference signals can enter an Rx channel, and a secondary cancellation circuit in an analog domain is designed in the figure, namely, an original Tx signal generates a same-amplitude reverse radio frequency signal which can cancel the residual self-interference signals after passing through an adjustable shaping circuit, and generates an effect of canceling the residual self-interference signals after being superposed with signals of the Rx channel. Finally, a small amount of residual self-interference signals cannot be completely cancelled and enter a baseband receiving channel, and the residual sub-interference signals can be estimated in a digital domain through a baseband processing algorithm so as to carry out three-level cancellation. After three-level self-interference signal cancellation, the transmitting signal of the Tx channel cannot interfere the normal receiving of the Rx channel signal, and therefore the full-duplex transceiving node capable of transmitting and receiving simultaneously is achieved.
The at least three nodes comprise a first node and a second node, and the second node is any one of the at least three nodes except the first node. Different nodes may have the same or different priorities. The first node and the second node may be a plurality of types of nodes in the PLC system. For example, in the g.hn standard related to the PLC network, the first node and the second node may be Domain Masters (DMs) or end nodes (EP) in the PLC system; in the IEEE1901.1 standard related to a PLC network, the first node and the second node may be a Central Coordinator (CCO) or a Station (STA) in the PLC system. It should be noted that the first node and the second node may also be other types of nodes, which is not limited in this application. The types of the first node and the second node may be the same or different, for example, the first node is a DM, the second node is an EP, or the first node is a CCO, and the second node is an STA, which is not limited in this application.
It should be noted that the embodiments of the present application can be applied not only to a PLC communication system but also to any full duplex communication system.
In combination with the above system architecture, a PLC method provided in the embodiments of the present application is described below. Referring to fig. 4, fig. 4 is a flowchart of a PLC method according to an embodiment of the present disclosure. The PLC method may be applied to a first node in a PLC system comprising at least three nodes in a full duplex operating mode, e.g. in an IBFD mode operating at the same time and the same frequency or in an FDD mode operating at different frequencies, i.e. each node may transmit and receive information at the same time. As shown in fig. 4, the PLC method may include the following steps.
Step S401: the second node sends the first information to the first node.
Accordingly, the first node receives the first information from the second node.
The second node is any one of the at least three nodes except the first node. The first information may be data or a control instruction, and in this embodiment, the priority of the control instruction is greater than the priority of the data.
The second node may send the first information to the first node in a broadcast or unicast form.
Step S402: the first node determines whether to interrupt the sending of the second information according to the priority of the second node and/or the priority of the first information, wherein the second information is the information currently sent by the first node.
After the first node receives the first information from the second node, whether to interrupt sending of the second information may be determined according to the priority of the second node and/or the priority of the first information, and a specific implementation manner may be as follows:
the method I comprises the following steps: the first node determines whether to interrupt the transmission of the second information according to the priority of the second node. Specifically, in the case where the priority of the second node is greater than the priority of the first node, the first node determines to interrupt the transmission of the second information. In this manner, the priority of different nodes may be different. In the IBFD mode, the first node and the second node both work in the same frequency band, and the priority of the second node is higher than that of the first node, so that after the first node receives the first information from the second node, the first node can interrupt the transmission of the current information of the first node, and the second node can monopolize a power line channel. In the FDD mode, the first node and the second node operate in different frequency bands, the second information sent by the first node and the first information sent by the second node do not interfere with each other, and the first node can determine that the sending of the current information of the first node is not interrupted.
Alternatively, the first node may determine the priority of the second node according to any one of a MAC address, an IP address, or a network identification of the second node. The network Identifier may be a network Identifier (ID) formed by the node during networking. The identification information may be carried in the header or the preamble sequence of the first information packet in some form, for example, the preamble sequence is shifted according to priority, nodes with different priorities may use different preamble sequences, or a priority flag is carried in the header of the first information packet.
The second method comprises the following steps: the first node determines whether to interrupt the transmission of the second information according to the priority of the first information. Specifically, in the case where the priority of the first information is greater than the priority of the second information, the first node determines to interrupt the transmission of the second information. In this manner, the priority of different information may be different. In the IBFD mode, the first node and the second node both operate in the same frequency band, and since the priority of the first information is higher than that of the second information, after the first node receives the first information from the second node, the transmission of the second information may be interrupted, so that the first information may be transmitted exclusively over the power line channel. In the FDD mode, the first node and the second node operate in different frequency bands, the second information sent by the first node and the first information sent by the second node do not interfere with each other, and the first node can determine not to interrupt sending of its current information.
Optionally, the first node may determine the priority of the first information according to any one of a service type, a sending method, or an information type corresponding to the first information, where an identifier used to indicate the service type may be carried in a packet header or a preamble sequence of the first information packet, for example, the information priority of the real-time service is greater than the information priority of the non-real-time service. For another example, the first node may determine the priority of the first information according to the transmission manner of the first information, for example, the priority of the first information transmitted in the broadcast form is higher than that of the first information transmitted in the unicast form. For another example, the first information may be a control instruction or data, and the priority of the control instruction is greater than the priority of the data.
The third method comprises the following steps: the first node determines whether to interrupt the transmission of the second information according to the priority of the second node and the priority of the first information.
In a possible implementation manner, the first node determines to interrupt sending of the second information under the condition that the priority of the second node is greater than the priority of the first node, and the priority of the first information is greater than the priority of the second information. As shown in fig. 5, for example, when the priority of the second node is greater than the priority of the first node, and the first information is used as a control instruction, and the second information is used as normal data, in the IBFD mode, when the first node receives the control instruction from the second node, it may be determined that the priority of the second node is greater than its own priority and the priority of the control instruction is greater than the normal data, so that the transmission of its current normal data may be interrupted, so that the second node may monopolize the power line channel, and it is ensured that the control instruction sent by the second node is preferentially sent. In one embodiment, the control instruction of the second node is broadcasted to all nodes, and in case that the second node interrupts its current transmission of the normal data, the second node can monopolize the power line channel, so as to ensure that the control instruction sent by the second node is received by other nodes in the PLC system. In the FDD mode, the frequency bands are different, and the first node can still normally transmit the common data without interrupting the transmission of the current common data.
In one possible implementation, the first node determines to interrupt the transmission of the second information when the priority of the second node is equal to the priority of the first node and the priority of the first information is greater than the priority of the second information. As shown in fig. 5, the priority of the second node is equal to the priority of the first node, and the first information is taken as a control instruction, and the second information is taken as ordinary data for example, so as to illustrate, in the IBFD mode, when the first node receives the control instruction from the second node, it may be determined that the priority of the control instruction is greater than the ordinary data, and therefore, the transmission of its current ordinary data may be interrupted, so that the second node may monopolize the power line channel, and it is ensured that the control instruction sent by the second node is preferentially sent. In the FDD mode, the frequency bands are different, and the first node can still normally transmit the common data without interrupting the transmission of the current common data.
In one possible implementation, the first node determines to interrupt the transmission of the second information when the priority of the second node is greater than the priority of the first node and the priority of the first information is equal to the priority of the second information. As shown in fig. 6, the priority of the second node is greater than the priority of the first node, and the first information is taken as a control instruction, and the second information is taken as a control instruction for example, in the IBFD mode, when the first node receives the control instruction from the second node, it may be determined that the priority of the second node is greater than its own priority, so that the transmission of its current control instruction may be interrupted, so that the second node may monopolize the power line channel, and it is ensured that the control instruction sent by the second node is preferentially sent. In the FDD mode, the frequency bands are different, and the first node may still normally transmit the control instruction without interrupting the transmission of its current control instruction.
As shown in fig. 7, for example, the PLC system includes 3 nodes, which are a node x, a node y, and a node z, where the node x has the highest priority, and fig. 7 illustrates a contention transmission relationship among the 3 nodes in three time slices. 1) In the first time segment, only node x needs to send control commands, and other nodes (node y and node z) stop sending information. 2) And in the second time segment, the node x and the node y simultaneously send control instructions to generate collision, at the moment, the node y judges that the priority of the node y is lower than that of the node x according to the frame header of the control instructions, and the node y interrupts the continuous sending of the control instructions. 3) And in the third time segment when the node x finishes sending the control command, because the node x does not need to send, the node y monopolizes the channel and can send the control command.
In a possible implementation manner, the first node determines to interrupt sending of the second information under the condition that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the first type information. As shown in fig. 8, the priority of the second node is smaller than that of the first node, the first information is taken as a control instruction, and the second information is taken as ordinary data for example, in the IBFD mode, when the first node receives a control instruction from the second node, it may be determined that the priority of the second node is smaller than that of the first node and the priority of the control instruction is greater than that of the ordinary data, and the control instruction is broadcast (that is, all nodes need to receive the control instruction of the second node), and the first node may interrupt sending of its current ordinary data, so that the second node may monopolize the power line channel, and ensure that the control instruction sent by the second node is received by all other nodes.
In a possible implementation manner, the first node determines not to interrupt sending of the second information under the condition that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the second type information. As shown in fig. 9, for example, when the priority of the second node is smaller than the priority of the first node, and the first information is a control instruction, and the second information is normal data, in the IBFD mode, when the first node receives the control instruction from the second node, it may be determined that the priority of the second node is smaller than the priority of the first node and the priority of the control instruction is greater than the priority of the normal data, and the control instruction is unicast (that is, the second node only sends the control instruction to the first node), and the first node may not interrupt sending of the current normal data of the first node. In the FDD mode, the frequency bands are different, and the first node can simultaneously transmit the common data while receiving the control instruction from the second node.
In a possible implementation manner, the first node determines not to interrupt sending of the second information under the condition that the priority of the second node is smaller than the priority of the first node, the priority of the first information is equal to the priority of the second information, and the first information is of the second type information. As shown in fig. 10, the priority of the second node is smaller than that of the first node, and the first information is taken as a control instruction, and the second information is taken as a control instruction as an example, for illustration, in the IBFD mode, when the first node receives the control instruction from the second node, it may be determined that the priority of the second node is smaller than that of the first node and the control instruction is unicast (that is, the second node only sends the control instruction to the first node), and the first node may not interrupt sending of its current control instruction. In the FDD mode, the frequency bands are different, and the first node can simultaneously send the control instruction while receiving the control instruction from the second node.
Further optionally, if the first node determines to interrupt the sending of the second information, after the preset time, the first node may also resume the sending of the second information.
According to the embodiment of the application, a plurality of nodes in the PLC system can be in a full-duplex working mode, namely, information can be transmitted and received simultaneously. On the basis, the first node can determine whether to interrupt the transmission of the current information according to the priority of the second node and/or the priority of the first information from the second node, the interruption of the transmission of the current information can actively avoid channel resources, the high-priority node and/or the high-priority information interrupt the transmission of the low-priority node or the low-priority information, the channel resources are occupied preferentially, the information conflict among multiple nodes in the PLC system can be solved, the transmission delay of the high-priority information is reduced, the rapid communication among the multiple nodes is realized, and the communication efficiency of the PLC system is improved.
The embodiments of the method provided in the embodiments of the present application are described above, and the embodiments of the apparatus related to the embodiments of the present application are described below. The apparatus and related products provided herein include, but are not limited to, communication servers, routers, switches, network bridges, computers, cell phones, watches, headsets, televisions, homes, and other electronic devices.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a PLC device according to an embodiment of the present disclosure, where the PLC device may be a first node in a PLC system including at least three nodes, and may also be a device (e.g., a chip, or a system of chips, or a circuit) in the first node, where the at least three nodes are in a full-duplex operating mode. The communication device has the functionality to implement the actions in the method instance of the first aspect described above. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. As shown in fig. 11, the apparatus 1100 includes at least: a transceiving unit 1101 and a processing unit 1102; wherein:
a transceiving unit 1101 configured to receive first information from a second node, where the second node is any one of at least three nodes except for a first node;
the processing unit 1102 is configured to determine whether to interrupt sending of second information according to the priority of the second node and/or the priority of the first information, where the second information is currently sent by the first node.
In an embodiment, the processing unit 1102 is specifically configured to: and determining to interrupt the transmission of the second information in the case that the priority of the second node is greater than the priority of the first node.
In an embodiment, the processing unit 1102 is specifically configured to: in the case where the priority of the first information is greater than the priority of the second information, it is determined to interrupt the transmission of the second information.
In an embodiment, the processing unit 1102 is specifically configured to:
under the condition that the priority of the second node is greater than that of the first node and the priority of the first information is greater than that of the second information, the sending of the second information is determined to be interrupted; or
Determining to interrupt the transmission of the second information under the condition that the priority of the second node is equal to the priority of the first node and the priority of the first information is greater than the priority of the second information; or
And determining to interrupt the transmission of the second information under the conditions that the priority of the second node is greater than that of the first node and the priority of the first information is equal to that of the second information.
In an embodiment, the processing unit 1102 is specifically configured to: and determining to interrupt the transmission of the second information under the condition that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the first type information.
In an embodiment, the processing unit 1102 is specifically configured to: and under the conditions that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is the second type information, determining not to interrupt the transmission of the second information.
In one embodiment, the processing unit 1102 is further configured to: and resuming the transmission of the second information after a preset time.
In one embodiment, the processing unit 1102 is further configured to: and determining the priority of the second node according to any one of the MAC address, the IP address and the network identification of the second node.
For more detailed description of the transceiver 1101 and the processing unit 1102, reference may be directly made to the description of the first node in the method embodiments shown in fig. 4 to fig. 10, which is not repeated herein.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a PLC apparatus according to an embodiment of the present disclosure, and as shown in fig. 12, the apparatus 1200 may include a processor 1201, where the processor 1201 may also be referred to as a processing unit, and may implement a certain control function. The processor 1201 may be a general-purpose processor, a special-purpose processor, or the like.
In an alternative design, the processor 1201 may also have stored therein instructions and/or data that may be executed by the processor to cause the apparatus 1200 to perform the methods described in the method embodiments above.
In another alternative design, the processor 1201 may include a transceiver unit to perform receive and transmit functions. The transceiving unit may be, for example, a transceiving circuit, or an interface circuit, or a communication interface. The transceiver circuitry, interface or interface circuitry for implementing the receive and transmit functions may be separate or integrated. The transceiver circuit, the interface circuit or the interface circuit may be used for reading and writing code/data, or the transceiver circuit, the interface circuit or the interface circuit may be used for transmitting or transferring signals.
In yet another possible design, apparatus 1200 may include circuitry that may perform the functions of transmitting or receiving or communicating in the foregoing method embodiments.
Optionally, the apparatus 1200 may include one or more memories 1202, which may store instructions executable on the processor 1201 to cause the apparatus 1200 to perform the methods described in the above method embodiments. Optionally, the memory may further store data therein. Optionally, instructions and/or data may also be stored in the processor. The processor and the memory may be provided separately or may be integrated together. For example, the correspondence described in the above method embodiments may be stored in a memory or in a processor.
Optionally, the apparatus 1200 may further include a transceiver 1203 and/or an antenna 1204. The transceiver 1203 may be referred to as a transceiver unit, a transceiver circuit, a transceiver device, a transceiver module, or the like, and is configured to implement a transceiving function. Optionally, the apparatus 1200 may further comprise a bus 1205, by which the processor 1201, the memory 1202, and the transceiver 1203 may be coupled.
The processors and transceivers described herein may be implemented on Integrated Circuits (ICs), analog ICs, radio Frequency Integrated Circuits (RFICs), mixed signal ICs, application Specific Integrated Circuits (ASICs), printed Circuit Boards (PCBs), electronic devices, and the like. The processor and transceiver may also be fabricated using various IC process technologies such as Complementary Metal Oxide Semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (PMOS), bipolar Junction Transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.
The apparatus in the above embodiment description may be the first node, but the scope of the apparatus described in the present application is not limited thereto, and the structure of the apparatus may not be limited by fig. 12. The apparatus may be a stand-alone device or may be part of a larger device. For example, the apparatus may be:
(1) A stand-alone integrated circuit IC, or chip, or system-on-chip or subsystem;
(2) A set of one or more ICs, which optionally may also include storage components for storing data and/or instructions;
(3) An ASIC, such as a modem (MSM);
(4) A module that may be embedded within other devices;
(5) Others, etc.
Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, can implement the PLC method provided in the foregoing method embodiments.
Embodiments of the present application also provide a computer program product, which when run on a computer or a processor, causes the computer or the processor to perform one or more steps of any of the PLC methods described above. The respective constituent modules of the above-mentioned apparatuses may be stored in the computer-readable storage medium if they are implemented in the form of software functional units and sold or used as independent products.
An embodiment of the present application further provides a chip system, which includes at least one processor and a communication interface, where the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform some or all of the steps including any one of the method embodiments described in the foregoing fig. 4 to fig. 10. The chip system may be formed by a chip, or may include a chip and other discrete devices.
The embodiment of the present application further discloses a PLC system, which includes a first node and a second node, and the PLC method shown in fig. 4 to fig. 10 may be referred to for specific description.
It will be appreciated that the memory referred to in the embodiments of the application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a Hard Disk Drive (HDD), a solid-state drive (SSD), a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.
It should also be understood that the processor mentioned in the embodiments of the present application may be a Central Processing Unit (CPU), and may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.
It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments provided herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the technology may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various media capable of storing program codes.
The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.
The modules/units in the device of the embodiment of the application can be combined, divided and deleted according to actual needs.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.
Claims (20)
1. A Power Line Communication (PLC) method applied to a first node in a PLC system including at least three nodes, the at least three nodes being in a full-duplex operating mode, the method comprising:
the first node receives first information from a second node, wherein the second node is any one of the at least three nodes except the first node;
and the first node determines whether to interrupt the sending of second information according to the priority of the second node and/or the priority of the first information, wherein the second information is the information currently sent by the first node.
2. The method of claim 1, wherein the first node determining whether to discontinue sending second information based on the priority of the second node comprises:
the first node determines to interrupt the transmission of the second information in a case where the priority of the second node is greater than the priority of the first node.
3. The method of claim 1, wherein the first node determining whether to discontinue transmission of second information based on the priority of the first information comprises:
and under the condition that the priority of the first information is greater than that of the second information, the first node determines to interrupt the transmission of the second information.
4. The method of claim 1, wherein the first node determining whether to interrupt the transmission of the second information according to the priority of the second node and the priority of the first information comprises:
the first node determines to interrupt the sending of the second information under the conditions that the priority of the second node is higher than that of the first node and the priority of the first information is higher than that of the second information; or alternatively
The first node determines to interrupt the transmission of the second information in the case that the priority of the second node is equal to the priority of the first node and the priority of the first information is greater than the priority of the second information; or
And the first node determines to interrupt the transmission of the second information under the condition that the priority of the second node is greater than that of the first node and the priority of the first information is equal to that of the second information.
5. The method of claim 1, wherein the first node determining whether to interrupt the transmission of the second information according to the priority of the second node and the priority of the first information comprises:
and under the conditions that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is first type information, the first node determines to interrupt the transmission of the second information.
6. The method of claim 1, wherein the first node determining whether to discontinue sending second information based on the priority of the second node and the priority of the first information comprises:
and under the conditions that the priority of the second node is less than that of the first node, the priority of the first information is greater than that of the second information and the first information is of a second type, the first node determines not to interrupt the transmission of the second information.
7. The method of any one of claims 1-6, further comprising:
and after the preset time, the first node recovers the sending of the second information.
8. The method according to any one of claims 1-7, further comprising:
the first node determines the priority of the second node according to any one of a Media Access Control (MAC) address, an Internet Protocol (IP) address and a network identifier of the second node.
9. A power line communication PLC apparatus, characterized in that the apparatus comprises:
a transceiver unit, configured to receive first information from a second node, where the second node is any one of the at least three nodes except the first node;
and the processing unit is used for determining whether to interrupt the sending of second information according to the priority of the second node and/or the priority of the first information, wherein the second information is the information currently sent by the first node.
10. The apparatus according to claim 9, wherein the processing unit is specifically configured to:
determining to interrupt the transmission of the second information if the priority of the second node is greater than the priority of the first node.
11. The apparatus according to claim 9, wherein the processing unit is specifically configured to:
and determining to interrupt the transmission of the second information when the priority of the first information is greater than the priority of the second information.
12. The apparatus according to claim 9, wherein the processing unit is specifically configured to:
determining to interrupt the transmission of the second information under the condition that the priority of the second node is greater than the priority of the first node and the priority of the first information is greater than the priority of the second information; or
Determining to interrupt the transmission of the second information under the condition that the priority of the second node is equal to the priority of the first node and the priority of the first information is greater than the priority of the second information; or
And determining to interrupt the transmission of the second information under the conditions that the priority of the second node is greater than that of the first node and the priority of the first information is equal to that of the second information.
13. The apparatus according to claim 9, wherein the processing unit is specifically configured to:
and determining to interrupt the transmission of the second information under the condition that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is first type information.
14. The apparatus according to claim 9, wherein the processing unit is specifically configured to:
and determining not to interrupt the sending of the second information under the condition that the priority of the second node is smaller than that of the first node, the priority of the first information is larger than that of the second information, and the first information is of a second type.
15. The apparatus according to any of claims 9-14, wherein the processing unit is further configured to:
and resuming the transmission of the second information after a preset time.
16. The apparatus according to any of claims 9-15, wherein the processing unit is further configured to:
and determining the priority of the second node according to any one of the MAC address, the IP address and the network identifier of the second node.
17. A power line communication, PLC, apparatus applied to a first node in a PLC system comprising at least three nodes, the at least three nodes being in a full duplex mode of operation, the apparatus comprising a processor and a memory, the processor being coupled to the memory, the memory being configured to store a program or instructions which, when executed by the processor, cause the apparatus to perform the method of any of claims 1-8.
18. A computer-readable storage medium, in which a computer program or computer instructions are stored which, when executed, implement the method according to any one of claims 1 to 8.
19. A computer program product, characterized in that it comprises computer program code which, when executed, implements the method according to any one of claims 1-8.
20. A power line communication PLC system comprising a PLC apparatus according to any one of claims 9 to 16.
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| CN202210617844.5A CN115242267A (en) | 2022-06-01 | 2022-06-01 | Power line communication PLC method and device |
| PCT/CN2023/096846 WO2023231967A1 (en) | 2022-06-01 | 2023-05-29 | Power line communication (plc) method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210617844.5A CN115242267A (en) | 2022-06-01 | 2022-06-01 | Power line communication PLC method and device |
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| WO2023231967A1 (en) * | 2022-06-01 | 2023-12-07 | 华为数字能源技术有限公司 | Power line communication (plc) method and apparatus |
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| US20050018703A1 (en) * | 2002-01-18 | 2005-01-27 | Jorge Vicente Blasco Claret | Process for the transmission of data by a multi-user, point to multi-point digital data transmission system |
| WO2009113930A1 (en) * | 2008-03-14 | 2009-09-17 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for prioritising channel allocation |
| CN102916797A (en) * | 2012-09-26 | 2013-02-06 | 陕西科林能源发展股份有限公司 | Duplex communication method used for geothermal power generation |
| CN105577346A (en) * | 2014-10-31 | 2016-05-11 | 美国博通公司 | In-band full-duplex operation |
| CN110463135A (en) * | 2017-03-31 | 2019-11-15 | 华为技术有限公司 | Full duplex transmission method and device |
| WO2021197087A1 (en) * | 2020-03-28 | 2021-10-07 | 华为技术有限公司 | Communication priority determining method and apparatus |
| CN113938161A (en) * | 2020-06-29 | 2022-01-14 | 华为技术有限公司 | Power line communication PLC method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023231967A1 (en) * | 2022-06-01 | 2023-12-07 | 华为数字能源技术有限公司 | Power line communication (plc) method and apparatus |
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| WO2023231967A1 (en) | 2023-12-07 |
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